Police have also released new images of five-year-old Nathan O'Brien and Kathryn Liknes.Calgary Police
/ Calgary Police

Calgary Police gave a brief update asking for further assistance from the public in the search for Alvin and Kathryn Liknes and their grandson Nathan O’Brien.Colleen De Neve
/ Calgary Herald

The family of five-year-old Nathan O'Brien is seen in a photo from social media. The boy was last seen at his grandparents' home Sunday night..
/ Facebook

Rod and Jennifer O'Brien made an emotional public plea for the return of their 5-year-old son Nathan who, along with his grandparents Alvin and Kathryn Liknes, was declared missing Monday morning.Ted Rhodes
/ Calgary Herald

Jennifer O’Brien clutches fabric of her son alongside her husband Rod at a press conference regarding their missing son Nathan at Calgary Police headquartersTed Rhodes
/ Calgary Herald

Police have also released new images of five-year-old Nathan O'Brien and Alvin + Kathryn LiknesCalgary Police
/ Calgary Police

Calgary police are now "convinced" someone has information into the disappearance of five-year-old Nathan O'Brien and his grandparents, as 40 investigators review surveillance video and interview potential witnesses.

"We've got people assigned to making sure that all tips are prioritized and they're followed up on," Chief Rick Hanson told reporters. "We will continue to devote resources to this until it's resolved one way or the other."

Police still have no suspects and no motive in the suspected kidnapping of Alvin and Kathryn Liknes, and their grandson Nathan, which has attracted over a hundred tips from across the country.

There are "no suspects I can name," Staff Sgt. Doug Andrus said. When pressed as to whether there was anyone of interest, he replied: "We've had information that's allowed us to move forward."

Nathan was last seen by his mother Sunday evening when she dropped him off to the home of his grandparents. Police believe the trio left the Likneses's Parkhill home against their will some time between Sunday night and Monday morning, following an estate sale at the house over the weekend.In the last 24 hours, the case has become "less of a mystery to us," Andrus said. "I can't comment on the degree."

The missing persons investigation has gripped Calgary and attracted messages of hope and support from across the country. A blog set up to capture those messages, www.nathankathyalvin.com, features 400 posts and counting.

"Our hearts go out to the family. I can't think of anything more devastating or more tragic than to have to deal with an event like this," Hanson said. "We also realize how it impacts the community. I know that everybody in this community is looking at their own streets, looking at their own homes, looking at their own kids, and wondering if they're doing enough to keep them safe.

"I can assure the citizens of this community that we are putting every resource that's required, every resource that's necessary into following up every lead and making sure this investigation is thorough and complete."

While investigators follow up on fresh tips that emerged after the families of the missing trio issued pleas for help, police are also stationed at the Parkhill Stanley Park Community Hall to speak with anyone who attended the estate sale at the Liknes' home over the weekend.

The couple had been preparing for a long-planned move to Mexico, but police believe they were abducted along with their grandson between Sunday night and Monday morning.

Police are trying to figure out what items were purchased at the estate sale and what remains in the home. Anyone who attended the sale is asked to stop by the Parkhill Stanley Park Community Hall at 4013 Stanley Road S.W., from 10 a.m. to 10 p.m.

If they bought something, they are asked to bring a photo of their purchase.

Andrus said police believe two or three hundred people attended the estate sale. "Anyone could have information that's pertinent to the investigation," he said.

"We're very confident that we're gonna find these people, and we hope we'll find them alive," Andrus said.

* As the Amber Alert continues for the fourth day, the Calgary Herald is reporting live on any new developments in the community's search for the missing trio.

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